| 1. |
- Ivanov, B. A., et al.
(author)
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Nonstationary forced motion of domain walls in ferrimagnets near the spin compensation point
- 2020
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In: Low Temperature Physics. - : AIP Publishing. - 1063-777X .- 1090-6517. ; 46:8, s. 841-850
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Journal article (peer-reviewed)abstract
- The motion of domain walls in ferrimagnets near the sublattice spin compensation point is studied theoretically, when there is an exchange enhancement in the limiting velocity of the wall. Nonlinear regimes of high-velocity nonstationary wall motion are found. A magnet parameter region in which the collective variable approach is invalid, is detected. In this region, the wall motion is accompanied by the periodic appearance of instability with respect to the increase in spin oscillations inside the domain wall.
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| 2. |
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| 3. |
- Galkina, E. G., et al.
(author)
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SPIN DYNAMICS IN ANTIFERROMAGNETS WITH DOMAIN WALLS AND DISCLINATIONS
- 2020
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In: Ukrainian Journal of Physics. - : National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications). - 2071-0186 .- 2071-0194. ; 65:10, s. 924-938
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Journal article (peer-reviewed)abstract
- The spin dynamics in antiferromagnets with atomic dislocations and dislocation-induced spin disclinations has been discussed. It is shown how the usual sigma-model equation can be used to describe it. The dynamical states with the spatially inhomogeneous spin precession are studied. It is demonstrated that such an internal dynamics of the spin disclinations and the related domain walls can serve as a basis for creating a spin-Hall nanogenerator pumped with a spin current and characterized by a low excitation threshold.
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| 4. |
- Ovcharov, Roman, 1997, et al.
(author)
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Spin Hall Nano-Oscillator Based on an Antiferromagnetic Domain Wall
- 2022
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In: Physical Review Applied. - 2331-7019. ; 18:2
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Journal article (peer-reviewed)abstract
- We propose here a high-frequency spin-Hall nano-oscillator based on a simple magnetic texture, such as a domain wall, located in an antiferromagnet with an easy-axis anisotropy type. We show that the spin current, polarized along the anisotropy axis, excites a conical precession of the Neel vector in such a domain wall, which allows obtaining a robust ac output signal-contrary to the planar precession in a uniform uniaxial antiferromagnet, where ac output is hard to achieve. The frequency of the auto-oscillations is easily tunable by the applied current up to the terahertz range, and the threshold current vanishes for a pure uniaxial antiferromagnet. By micromagnetic simulations, we demonstrate that the pinning of the domain wall is crucial for the oscillator design, which can be achieved in the nanoconstriction layout of the free layer.
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